Furnace attachment



(Nc Model.)

T.4 CLIFFORD. Y TURNAGE ATTACHMENT.'

` No. 550,017. y Patented Nov. 1,-9, 18951..

INVENTOR ATTORNEY ANDREW BLRAHAM. PHUTOUTNOAWASHINETMD.

UNITED STATES 'PATENT OFFICE.

THOMAS CLIFFORD, OF ROCHESTER, NEIV YORK.

FU RNACE ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 550,017, dated November19, 1895. Application filed October 22, 1894. Serial No. 526,537. (llomodel.)

To @ZZ whom it may concern:

Be it known that 1, THOMAS CLIFFORD, of Rochester, in the county ofMonroe, in the State of New York, have invented new and usefulImprovements' in Furnace Attachments, of which the following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

My invention relates to improvements in furnace attachments of the classset forth in my previous patent, No. 467,157, dated J anuary 19, 1892,for preventing the escape of carbon with the gases of combustion,especially directly after fresh fuel is inserted within the furnace, andhas for its object the production of a practical and efficient devicewhich is economically manufactured, is readily placed in operativeposition, and is automatic in its action; and to this end it consists,essentially, in a steam-pipe discharging within the combustion-chamberof the furnace, a

valve for said pipe provided with an operating part or lever connectedto the door of the furnace, whereby when the door is opened the valve isautomatically opened, a movable stop for holding the valve-operatingpart or lever in its position assumed when the valve is open, and anautomatic operating-piece for forcing said stop from operative position.

The invention also consists in an air-inlet for the combustion-chamber,through which the steam discharges for automatically drawing the airthrough said inlet into the combustion-chamber, a supplemental door forthe movable door of the furnace, a stop for holding the supplementaldoor in its open position, and Ain the detail construction andarrangement of the parts, all as hereinafter more particularlydescribed, and pointed out in the claims.

In describing this invention reference is had to the accompanyingdrawings, forming a part of this specification, in which like lettersindicate corresponding views.

Figure l is an elevation, partly in section, of a portion of a furnaceprovided with my invention. Fig. 2 is a detail elevation, partly insection, of a portion of one of the stops for the supplemental doors, apart of the lever for operating said stop, the operating part or leverfor the valve of the steam-pipe, the stop parts in all the for saidlever, and the movable operatingpiece for rocking said stop fromoperative position. Fig. 3 is an enlarged elevation o f one end of thedetached operating-piece. Figs. 4 and 5 are transverse detail sectionalviews taken, respectively, on lines 44, Fig. 1, and 5 5, Fig. 2. Fig. 6is a detail top plan view, partly in section, of a portion of thesteam-pipe, illustrating particularly the steam discharging jet; andFig. 7 is a detail sectional view'illustratinga modified form ofsupplemental dooropening device.

' It is well known that a great waste in fuel is occasioned in theoperation of furnaces of the various kinds by the escape of carbon withthe products of combustion, especially directly after fresh fuel isinserted within the combustion-chamber. Various devices have beenproduced for preventing the escape of the carbon; but none of these haveas yet come into general use.

My present invention consists of a simple device which can be attachedto any furnace `without the exercise of great skill,is automatic in itsaction, and is eective in operation.

A represents the front plate of a furnace,

`provided with hinged doors a a, opening into the combustion .chamber,(not illustrated,)

Vand B a generator, which may be of any desirable form, size, andconstruction, and is supported in the usual manner above thecombustion-chamber.

O is a pipe for conveying steam or other fuel within the furnacecombustion-chamber, and, as clearly seen in the drawings, one end ofsaid pipe is provided with a series of outlets or jets C', Fig. 6,removably secured to lateral branches of said pipe and provided withoutwardly-diverging outlet-apertures c, and the other end may beconnected by a branch c' to the generator B and may be provided with ahand-valve c2, of any desired construction, not necessary to hereinillustrate or describe, for regulating the amount of steam passedthrough said pipe.

D is an automatic valve, also of any suitable construction, for the pipeC, which regulates the Iiow therethrough when the valve c2 is open, andd is an operating part or lever pivoted at d to an arm of thevalve-shell and hinged at d2 to a plunger d3, which opens and ICO closesthe valve D. As this valve D may be of any desired construction and iswell known to one skilled in the art, it is unnecessary to furtherillustrate or describe the same.

One extremity of the operating part or lever (l is provided with aweight (Z4 for normally elevating the opposite end of the operating partor lever (l, and thereby elevating the plunger (Z3 and closing the valveD. The opposite end of the operating part or lever (l is guided in anarm (l upon the frame of the valve and is connected by a chain or othersuitable connection d to an arm (L upon the corresponding door (l. Theconnection (l6 is passed through au eye (Z7 upon the front plate A.

As the door is opened,the connection d, which is normally more or lessslack, is operated to depress the adjacent end of the lever (l andelevate its weighted extremity to the position indicated by dotted linesat Fig. l, and thereby open the valve D, whereupon the steam isdischarged through the jets or outlets C C of the pipe C into thecombustionchamber. Consequently as fuel is added after opening the doorthe steam discharged within the combustion-chamber greatly acceleratesits combustion and reduces the escape of carbon with the products ofcomb ustion. This action is greatly augmented by the inlet of air withinthe combustion-chamber, and Athe inlet of the air is effectedbyproviding the front plate A with a series of inlets A A and dischargingthe steam from the outlets or jets C' C through said air-inlets, andthereby drawing the air within the combustion-chamber. I also effect theinlet of the air by providing each of the doors a a with an opening a2therethrough at its base, arranged beneath the outlets or jets of thepipe C, and a supplemental door a3, hinged by a pivotal pin a4 at itslower edge. The upper edges of the supplemental doors are movableinwardly, as clearly seen at Fig. et, and said doors consequently forminclined walls, by which the air entering the openings (L2 a2 isdirected upwardly toward the steam discharged by the outlets or jets ofthe pipe C.

Each supplemental door is provided on its outer face with alaterally-extending arm a5, having an upturned end or engaging shouldera6, and each door a is provided with a movable stop or catch A2, havinga Weighted eX- tremity formed with an upwardly-inclined engaging face(i7, and a stop-shoulder or face as, slightly separated from theadjacent portion of the outer face of the door. Pins or lugs a upon thedoors a` limit the downward move` ment of the weighted ends of the stopsor catches A2.

The lower edge of each of the supplemental doors a3 is provided with anarm am, secured to one extremity of a chain or other suitable connectiona, having its upper end secured to a support or loop al? upon the frontplate A. As the doors (L are opened, the chains or connections a elevatethe arms al() of the supplemental doors d and rock inwardly the uppei`portions of said supplemental doors and permit the entra-nee of air tothe combustionchamber through the openings a2 (t2 when the doors a areclosed. As the supplemental doors are opened, their engaging ends acncounter the inclined faces (L7 of the stops A2 and elevate theweighted ends thereof, and then engage the adjacent portions of theouter faces of the doors (t a and limit the inward movement of thesupplemental doors. The weighted ends of the stops A2 are automaticallydepressed as the ends (1, of the arms (L5 pass beyond the faces (L7 ofthe stops, and the faces a8 of said stops then engage the outer face ofthe engaging end of the arms (t5 and prevent the retrograde or closingmovement of the supplemental doors (di.

The adjacent ends of the stops A2 for the supplemental doors areprovided with upwardly-extending arms A?, having lateral extremities,one being arranged beneath and the other above the opposite extremitiesof a lever E, pivoted at c to the front plate A and hav ing one endconnected by a chain or other con-- nection c to the free unweighted endof the operating part or lever d.

F is a stop for holding the lever (Z in its po sition assumed when thevalve D is open, and G is a movable operating-piece for forcing saidstop from operative position. The stop F is pivoted by a pivotal pin fat its upper end and normally assumes a vertical position, and isprovided at its lower end with a shoulder ffor en gaginga shoulder d8upon the weighted end of the lever (l and preventing the descent of saidweighted end. The stop F is also formed with an inclined face f2,extending from the shoulder j", and as the operating part orlever d isrocked to its position (shown by dotted lines at Fig. l) and itsweighted end is elevated the shoulder (ZS of the lever (l engages theinclined face f2 of the stop F and rocks said stop on its pivot. As soonas the shoulder (18 is elevated above the shoulder f', the stop Fassumes its normal position, with its shoulder f directly beneath theshoulder (ZH, and the weighted end of the lever (l is then preventedfrom downward movement.

The operating-piece G is preferably supported at one side of the doors(l, a, and consists, preferably, of a closed cylinder pivoted at Gr andprovided with an internal chamber containing mercury or other similarliquid, and provided at its central portion with a transverse partitiong, having a central passage opened and closed by a valve g forpermitting the ready passage of the liquid to the normally-depressed endg2 of said operatingpiece and preventing the return movement of saidliquid. The operating-piece G is also provided with a valve g3,consisting of a screw having its inner end movable within a groove g4 inthe transverse partition g in the chamber of the operating-piece andhaving its outer end extended beyond said chamber for facilitatingadjustment of said valve. This IDO IOS

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valve is readily adjusted to regulate the return movement of the liquidthrough the groove g4 when the operating-piece is forced to itsposition. (Indicated by dotted lines at Fig. l.

H is a link having one end hinged to the normally-depressed or Weightedend of the 0perating part or lever d and the other connected with a lostmotion to the operatingpiece G for forcing said operating-piece to itsposition (indicatedby dotted lines at Fig. l) as the operating part orlever` d is actuated to open the valve D by the opening of the door a.The connection of the link H to the operating-piece G by a lost motionmay be effected in any desired manner; but as preferably constructedsaid operating-piece is formed with a lateral arm having a curved slotgf, the opposite ends of which form separate bearing-faces, betweenwhich the upper end of the link is movable. Said end of the linknormally engages the lower end or bearingfaces of the slot g, and as theoperating-part or lever d is rocked 4to its position (indicated bydotted lines at Fig. l) the end of the link engages the upper end orbearing-face of the slot g(i and rocks the operating-piece G to itsposition, (indicated by dotted lines at Fig. 1,) with itsnormally-elevated end depressed into close proximity to a stop I.

Vhen a sufficient amount of the mercury or other liquid within thechamber of the operating-piece has flowed through the passage g4 bymeans of the adjustment of the valve g3 to counterbalance the end g2 ofthe operating-piece, said operating-piecey is rocked on its pivot untilits opposite end engages the stop I.

The operating-piece G is provided with a face g7, which is by thismovement of the operating-piece engaged with the upper end of the stop Fand rocks said stop on its pivot until its shoulder flv is disengagedfrom the shoulder ds of the lever D, whereupon the weighted end of saidlever is automatically depressed, and thereby closes the valve D andoperates the lever E to elevate the weighted ends of the stops A2 A2 forthe supplemental doors a3. As the operatingpart or leverd assumes itsnormal position, the link H engages the lower engaging face of the slotg6 of the operating-piece and rocks said operatingpiece to its normalposition, whereupon the liquid within the same returns to its end g2.

In the practical operation of my invention the doors a are opened topermit the entrance of fuel and the supplemental doors are automaticallyopened, and by the connection d6 and the lever cl the valve D is openedand steam passes from the jets or outlets C of the pipe C through theinlets A into the combustionchamber of the furnace and forcibly drawsany air through-said inlets into the combustion-chamber.

ver d is operated to open the valve D, the stop therefor prevents thedownward movement of the weighted end of said lever, and the move- Asthe operating part or lement of the operating part or lever d also rocksthe operating-piece on its pivot. The doors are then closed and the airenters the combustion-chamber through the openings in said door sincethe supplemental doors are open, and after a suitable interval of timethe operating-piece automatically rocks on its pivot and forces fromoperative position the stop for the operating part or lever d, whereuponsaid operating part or lever closes the valve D, and thereby shuts offthe entrance of steam within the combustion-chamber and operates thelever E to permit the automatic closing of the supplemental doors. Bythe adjustment of the valve g3 the length of time required to effect theautomatic rocking of the operating-piece for shutting off the entranceof steam to the combustion-chamber may be regulated at will, and theamount of steam passed to the valve D may be regulated at will by thevalve c2.

At Fig. 7 I have shown a modified form of supplemental door-openingmeans in which the vdoor d20 is provided with an opening C021 andl witha supplemental door aso, hinged thereto at 0,404 forV closing saidopening am. The supplemental door`a39 is provided with a movable armCL50, having its upper end pivoted upon the Vhinge-pin L40 Vand providedwith a shoulder extending upwardly ab ove the hin gepin @L40 forengaging the outer face of the door a3@ as the lower end of the arm CL50is rocked outwardly from the door d20. As the door d20 is closed, thelower end of the arm 0,50 engages a stationary cam a6, secured to asuitable support beneath the doors d20 e30, and the shoulder projectingfrom the upper end of said arm engages the supplemental door @L30 androcks the same inwardly from its n ormal closed position. When the doord20 is in normal closed position, the arm w50 is free to assume itsinoperative position, as its lower end has passed beyond the stationarycam 0,60, and when said door d20 is opened the arm gois free to swing onthe hingepin a4", since its lower end swings toward the door L20 and theshoulder at its upper end moves away from the supplemental door w30.

It is evident that the detail construction and arrangement of the partsof my furnace attachment may be considerably varied without departingfrom the spirit of my invention. Hence l do not herein specificallylimit myself to its detail construction and arrangement.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

l.v The combination with the combustion chamber and movable door of afurnace; of a pipe discharging within the combustion chamber, a valvefor said pipe provided with an operating part or lever connected to thedoor, whereby, when the door is opened, the valve is automaticallyopened, a movable stopfor holding the valve operating part or lever inits position assumed when the valve is open, and a movable operatingpiece connected to the stop for forcing said stop from operative IOO IIO

position, substantially as and for the purpose set forth.

2. The combination with the combustion chamber and movable door of afurnace; of a `pipe discharging within the combustion chamber, a valvefor said pipe provided with an operating part or lever connected to thedoor, whereby, when the door` is opened, the valve is automaticallyopened, a movable stop for holding the valve operating part or lever inits position assumed when the valve is open, a iixed support, and amovable operating piece mounted on said support and connected to thestop for forcing said stop from operative position and connected to saidoperating part or lever ofthe valve withv a lost motion, substantiallyas described.

3. The combination with the combustion chamber and movable door of afurnace; of a pipe discharging within the combustion chamber, a valvefor said pipe provided with an operating part or lever connected to thedoor, whereby, when the door is opened, the valve is automaticallyopened, a movable stop secured to the door for holding the valveoperating part or lever in its position assumed when the valve is open,a hollow movable operating piecefor forcing said stop from operativeposition provided with a liquid containing chamber, and valves forregulating the flow of the liquid through said chamber, substantially asand for the purpose specified.

et. The combination with a furnace combustion chamber having an airinlet and a movable door of the furnace; of asteam pipe dischargingthrough the air inlet for drawing the air therethrough into thecombustion chamber, a valve for said pipe provided with an operatingpart or lever connected to the door, whereby, when the door is opened,the valve is automatically opened, a movable stop for holding the valveoperating part or lever in its position assumed when the valve is open,and a movable operating piece for forcing said stop from operativeposition, substantially as and for the purpose described.

5. The combination with a furnace combustion chamber having an air inletand a movable door of the furnace; of a steam pipe discharging throughthe air inlet for drawing the air therethrough into the combustionchamber, avalve for said pipe provided with an opl erating part or leverconnected to the door, whereby, when the door is opened7 the valve isautomatically opened, a movable stop for holding the valve operatingpart or lever in its position assumed when the valve is open, a fixedsupport, and a movable operating piece for forcing said stop fromoperative position connected to said operating part or lever of thevalve with a lost motion, substantially as specified.

6. The combination with a furnace combustion chamber, the movable doorof the furnace provided with a supplemental door, and a stop for holdingsaid supplemental door open; of a pipe dischargin g within thecombustion chamber, a valve for said pipe provided with an operatingpart or lever connected to the door and to the stop for the supplementaldoor, whereby, when the door is open, the valve is automatically opened,and,whereby when the valve operating part or lever is moved from itsposition assumed when the valve is open, the stop for the supplementaldoor is also moved from its operative position, a movable stop forholding the valve operating part or lever in its position assumed whenthe valve is open, and a movable operating piece for forcing said stopfrom operative position, substantially as and for the purpose described.

7. The combination with a furnace combnstion chamber,the movable door ofthe furnace provided with a supplemental door, and a stop for holdingsaid supplemental door open of a pipe discharging within the combustionchamber, a valve for said pipe provided with an operating part or leverconnected to the door and to the stop for the supplemental door,whereby, when the door is open, the valve is automatically opened, and,whereby when the valve operating part or lever is moved from itsposition assumed when the valve is opened, the stop for the supplementaldoor is also moved from its operative position, a movable stop forholding the valve operating part or lever in its position assumed when`the valve is open, a fixed support, a movable operating piece forforcing said stop from opera-tive position connected to said operatingpart or lcver of the valve with a lost-motion, and provided with aliquid containing chamber, and valves for regulating the flow of theliquid through said chamber, substantially as and for the purposespecified. i

S. The combination with a furnace door, an automatically closingsupplemental door hinged to the furnace door and formed with a lateralarm having an engaging end, a movable stop or lever for detachablyengaging the lateral arm having a weighted end provided with an inclinedengaging face, a movable operating piece connected to the stop forforcing said stop from operative position and a stop shoulder or face,substantially as and for the purpose set forth.

9. The combination with a furnace combustion chamber, the movable doorsof the furnace, each provided with an automatically closing supplementaldoor, independently moving stops for preventing closing of thesupplemental doors, and a movable lever for operating said stops; of apipe discharging within the combustion chamber, a valve for said pipeprovided with an operating part or lever connected to the door and tothe stop operating lever, whereby the stop operating lever is actuated,a movable stop for holding the valve operating part or lever in itsposition assumed when the valve is opened, and a movable operating piecefor forcing said stop from operative position, substantially as and forthe purpose described.

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10. The combination with the combustion chamber and movable door of afurnace; of a pipe discharging within the combustion chamber, a valvefor said pipe provided with an operating weighted part or leverconnected to the door, a movable stop for holding the valve operatingpart or lever in its position assumed when the valve is opened, amovable operating piece having a shoulder for actuating said stop andprovided with separated engaging faces, and a link having one endsecured to the operating part or lever and the other engaged with saidfaces of the movable operating piece, substantially as described.

11. The combination with the combustion chamber and movable door of afurnace; of a pipe provided with a removable jet having outwardlydiverging outlet passages discharging within the combustion chamber, avalve for said pipe provided with an automatically movable operatingpart or lever connected to the door, whereby, when the door is opened,the valve is automatically opened, a movable stop for holding the valveoperating part or lever in its position assumed when the valve is open,and a movable operating piece for forcing said stop from operativeposition, substantially as and for the purpose set forth.

12. The combination of the combustion chamber of a furnace, a movabledoor for permitting access to the furnace provided with an openingtherethrough, an automatically closing supplemental door for closingported at one side of the door for automatically controlling the closingof the supplemental door, substantially as described.

13. The combination of the combustion chamber of a furnace, a movabledoor for permitting access to the furnace provided With an openingtherethrough, an automatically closing supplemental door for closingsaid opening, a stop supported by the movable door and preventing itsclosing for engaging the supplemental door, and an operating piece forautomatically controlling the closing of the supplemental door,substantially as speciied.

14. The combination of the combustion chamber of a furnace, a movabledoor for permitting access to the furnace provided with an openingtherethrough, an automatically closing supplemental door for closingsaid opening, a connection for automatically opening the supplementaldoor, and an operating piece supported at one side of the door forautomatically controlling the closing of the supplemental door,substantially as and for the purpose described.

In testimony whereof I have hereunto signed my name, in the presence oftwo attesting witnesses, at Rochester, in the county of Monroe, in theState of NewYork, this 18th day of September, 1893.

THOMAS CLIFFORD.

Witnesses:

HAMPDEN HYDE, WARREN H. BoLEs.

